2154004220421 has 12 divisors (see below), whose sum is σ = 3294359396172. Its totient is φ = 1351532059776.

The previous prime is 2154004220413. The next prime is 2154004220509. The reversal of 2154004220421 is 1240224004512.

It is a happy number.

2154004220421 is a `hidden beast` number, since 2 + 15 + 4 + 0 + 0 + 4 + 220 + 421 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1906636256100 + 247367964321 = 1380810^2 + 497361^2 .

It is not a de Polignac number, because 2154004220421 - 2³ = 2154004220413 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2154004220521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7039229326 + ... + 7039229631.

It is an arithmetic number, because the mean of its divisors is an integer number (274529949681).

Almost surely, 2^{2154004220421} is an apocalyptic number.

It is an amenable number.

2154004220421 is a deficient number, since it is larger than the sum of its proper divisors (1140355175751).

2154004220421 is a wasteful number, since it uses less digits than its factorization.

2154004220421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14078458980 (or 14078458977 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 27.

Adding to 2154004220421 its reverse (1240224004512), we get a palindrome (3394228224933).

The spelling of 2154004220421 in words is "two trillion, one hundred fifty-four billion, four million, two hundred twenty thousand, four hundred twenty-one".